Australia, isn’t it Oceania

America is a single continent too, or 3 subcontinents if you like to divide things.

(Turns out the OP’s definition is completely wrong, but who cares?)

It is? I learnt north and south were separate. So I guess what makes a continent a continent? Also what would the 3 subcontinents be? North, central, south? (Guesses wildly)

Everyone learns different definitions based on their education system’s world view, leading to a number of continents somewhere between 3 and 20. It turns out that nature doesn’t care for humans’ desire to put everything into neat, well-defined little boxes.